Hey Elizabeth - I have horsehair plaster walls - all the ones I have painted have been fine with latex paint.
I primed my walls with Glidden Ultra-Hide Gripper - and depending on the color we chose, I have either Ralph Lauren, Glidden Ultra-Hide, or ICI Dulux - in various sheens - as topcoat.
Why would you want to strip the paint that is on there now? Most importantly - why would you want to use calcimine?? Calcimines are terribly delicate - and nearly impossible to recoat!
I believe in better living through chemical technology. Stick with current good quality latex paints!
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